I struggle with that too...

I am much like you clean light eating the day before and the day of. Salads, fruits vegetable juice. Maybe a snack bar just to keep energy up. etc.

I normally try to eat something light 6-8 hours before session and clean out 90 minutes before. I will grab a snack often immediately before session and thats been safe.

I did recently do a session where i had a large dinner about 2 hours before. We were ready to go. It wasnt terrible but She discreetly grabbed a towel to handle the toy after the deed was done. So there was obviously some digestion.

Everyone is different. But i hope this helps.